吊杆损伤对外倾单肋式曲线钢拱桥自振特性的影响

Influence of Suspender Damage on Free Vibration Characteristics of the Curved Steel Arch Bridge with Single Extroversive Rib

为得到外倾单肋式曲线钢拱桥吊杆损伤对其结构动力特性的影响,以某人行钢拱桥为研究对象,采用Midas/Civil建立空间有限元模型,针对不同吊杆相同损伤程度或同一吊杆不同损伤程度对结构自振特性的影响进行了分析。分析结果表明:吊杆损伤降低了该桥梁结构的各阶自振频率,并具有自振频率降幅随吊杆损伤程度的增大而增加的特征,且结构第3阶自振频率的降幅受吊杆损伤影响程度最大。

To understand the influence on the free vibration characteristics of the special-shaped-curved steel arch bridge with single extroversive rib caused by suspender damage,a finite element model has been established by using Midas/Civil based on a steel arch bridge.In view of the same degrees of damage in different suspenders and different degrees of damage in the same suspender,the effects on natural vibration characteristics are analyzed.The results show that natural frequency of the bridge is reduced due to the suspender damage.With the increase of the damage degree,natural vibration frequency decreases,and suspender damage influences most greatly on the third order natural frequency of the structure.